Rough and slick jointer for filing saws



' June 1,1926.

A. F. DOUGAN ROUGH AND SLICK JONTER FOR FILING-SAWS Filed Feb. 16, 1925 -l Hull II Patented June UNITED fsTA'res @PATENT-20F 1,586,661 ffFicE.

ARGHIE F. DOUGAN, or cociinaiv, oiineon, Assrenoii or -iien'rY-iiiiin`fo'ivE-iiiiiv-y ,mientras 'ro PETER iieiisnngjor cocina-AN, iomieoiv.

ROUGH ANnsLioK Joiii'riin non FiLiNesAws.

l .Application filed FeiiriiaryA My invention isy for useiii iiling and joint-` ing cross cut sawsand has for its primary object the jointing of the saw `toreduce the teeth to a uniform height. f

Further objects of my invention consist in providing a file holder and slick which may be adapted to the curvature of the saw on its cutting edge.

A further object of my invention consists in the new and'novelmeans of maintaining a file midway the endsof the tool. e

A further object of my invention is to provide a ready meansI of changing the file or the placing of a file of different of cut in the holder.

A further object of myinventionconsists in providing tensioning means upon the file carrying member midway its ends and yad-4 justable stops forflo'cating the same in definite position.

Further objects of my invention consist in providing stops at or near the ends of the riilc carrying ,member to further facilitate uniform curif'ature upon the `file carrying member. l Y

j I attain these objects by the mechanism illustrated in the accompanying drawings'in which Fig. l is a side elevation of a cross cut saw illustrating my invention upon the same and adapted to the curvature of the cutting edge of the saw. `v Fig. 2 is a side elevation of the assembled device. Y Y

Fig. 3 is a fragmentary enlarged side elevatioiiv of the mid-'section ofthe device.

Fig. et is a sectional view taken on line 4 -4 of Fig. 2, looking in the direction indicated.

Fig. 5 is a fragmentary inverted lplan view of the VVfile holding mechanism illustrating the file in position. y

Fig. 6 is afr'aginentary side elevation of a saw showing tlieuneven lieiglits'of the teeth and the object toy be obtained by the use of my invention.

Like reference characters refer `to like parts throughout the several views.

1 is the saw which for different purposes, are ymade ofdifl'erent widths of blade and having different curvatures on the cutting edge, the curvature depending upon the character of material to be sawn and the size of the same.

l Heretofoi'e, t-he instruments for this pur- 16,1925. semi no. 9,616.

pose have beenpiovided with ya straight edge Y and the skill of theffiler determineshis ability to reduce the teeth along tliecurvature to a uniform height.

In my invention, before I start jointing the saw, I cause the curvature of the file holding member to conform to the curvature of the cutting edge of the saw Vto be filed; after which the filing is but ainatter of the passiiig of the instrument along the cutting edge of the saw until all teeth have been reduced Ato a uniform height.

' The instrument consists 'primarily of a frame member having a side'engaging member 2 adapted to engagement with the side ofthe saw and aback member 3 to which it is attached at the place of manufacture. The y frame is inadeof uniform material and suffixciently rigidto impart the curvature in the `iile holding member 4. The back member 3 has adi'iisting'screws 5 and 6 located at either side of the center line of kthe instrument and operate through kthe back member 3; A third screw 7 is passed centrally through the back member `'and having a thumb nut 8 attached thereto. Upon the vlower .endet the screw 7 is al file holding bracket 9 having projecting lugs 10 on either side adapted to engagement with the file 11. i'

The Yiile holding member 4. is adapted to lengageinent at its outer ends with 'the back 3, as shown at 12 andl and when pressure is applied upon the thumb screw 8, the file holder Vhas a curvature imparted thereto until the curvature is the same as that of the` saw to be jointed. "When the curvature has been determined the screws 5 and Gare then made to contact with the file holding member and additional pressure is then applied to form the same into a rigid unit rafter which the saw may be jointed by the passing of the instrument along the cutting edge ofthe saw untilgall teeth are reduced to ak uniform height.Y

` Having thus described my invention, I

wish to `make the following claim thereico A rough and slick jointer for filing saws,"

comprising a frame structure consisting of a side and back member, a flexible file holding member maintained within the lframe and parallel tothe lback member, said iile holding member having its outer ends contacting with the outer ends of the back member,

there being a spacebetween and centralof ilo said back and ile holding members to allow Jfor movement of the file holding member to and from the back member, means for maintaining a file Within the file holding member, said means comprising a bracket having projecting lugs, a screw secured to said bracket, passed centrally through the back member and, by means of a thumb screw, adapted to create sufficient pressure between the lugs 'i0 and the le holding member, to maintain a iile therebetween; a means to-mpart a cur Lseaeel rature to said ile holding member, Said means consisting of said bracket, screw and thumb screw pressing,` the central portion of the file holding member toward the central portion of the back member; and two adjusting screws placed one each side and adjacent the cen-rml bracket screw and adapted to impart n pressure on the file holding member, thereby maintaining` the frame and 20 ile holding member as a rigid unit.

ARCHIE VF. DOUGAN. 

